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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da041a748b642afcd6b8156c4c7c0610885cd0c413da89f8249db6b01ad81ae5' 
  AND token = 'Tae4KEOhvHTP8oTkJooaOD7Q8pDD4WvW5ZWYrIcFzD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}